An environmentally friendly approach to the green synthesis of azo dyes in the presence of magnetic solid acid catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 17738-17745 ◽  
Author(s):  
Javad Safari ◽  
Zohre Zarnegar
Keyword(s):  
Azo Dyes ◽  
Room Temperature ◽  
Solid Acid ◽  
Active Catalyst ◽  
Highly Active ◽  
Grinding Method ◽  
Solvent Free Conditions ◽  
Magnetic Solid ◽  
Magnetic Solid Acid ◽  
Environmentally Friendly Approach

Fe3O4@SiO2-SO3H as a highly active catalyst for the rapid diazotization reaction and synthesis of azo-dyes under solvent-free conditions by a grinding method at room temperature is described.

Synthesis and properties of magnetic solid acid catalyst S2O82-/ZrO2-Mn-Zn ferrite

2018 ◽  
Vol 34 (5) ◽  
pp. 285-291 ◽  
Author(s):  
Taiping Xie ◽  
Lianying Huang ◽  
Chenglun Liu ◽  
Longjun Xu
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Zn Ferrite ◽  
Magnetic Solid ◽  
Magnetic Solid Acid

scholarly journals Dinuclear thiazolylidene copper complex as highly active catalyst for azid–alkyne cycloadditions

2016 ◽  
Vol 12 ◽  
pp. 1566-1572 ◽  
Author(s):  
Anne L Schöffler ◽  
Ata Makarem ◽  
Frank Rominger ◽  
Bernd F Straub
Keyword(s):  
Acetic Acid ◽  
Organic Solvents ◽  
Copper Complex ◽  
Room Temperature ◽  
Active Catalyst ◽  
Catalyst Design ◽  
Ancillary Ligand ◽  
Click Reactions ◽  
Highly Active ◽  
Cost Efficient

A dinuclear N-heterocyclic carbene (NHC) copper complex efficiently catalyzes azide–alkyne cycloaddition (CuAAC) “click” reactions. The ancillary ligand comprises two 4,5-dimethyl-1,3-thiazol-2-ylidene units and an ethylene linker. The three-step preparation of the complex from commercially available starting compounds is more straightforward and cost-efficient than that of the previously described 1,2,4-triazol-5-ylidene derivatives. Kinetic experiments revealed its high catalytic CuAAC activity in organic solvents at room temperature. The activity increases upon addition of acetic acid, particularly for more acidic alkyne substrates. The modular catalyst design renders possible the exchange of N-heterocyclic carbene, linker, sacrificial ligand, and counter ion.

scholarly journals Simple Protocol for the Knoevenagel Condensation Under Solvent Free Conditions using Tungstophosphoric Acid as Catalyst

2019 ◽  
Vol 31 (10) ◽  
pp. 2181-2184
Author(s):  
Abdulrahman I. Alharthi
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Room Temperature ◽  
Model Compound ◽  
Knoevenagel Condensation ◽  
Maximum Yield ◽  
Tungstophosphoric Acid ◽  
Grinding Method ◽  
Solvent Free Conditions ◽  
Simple Protocol

The effect of calcination on the performance of tungstophosphoric acid for the product of Knoevenagel condensation was investigated. Substituted aldehydes and dimedone has been used in the presence of calcined tungstophosphoric acid as a heterogeneous catalyst using grinding method at room temperature. The results of reactions revealed that calcined tungstophosphoric acid has superior catalytic activity comparing to non-calcined catalyst in terms of yield and reaction time. Maximum yield of model compound was achieved by using 10 mol% of calcined catalyst in a reaction time that does not exceed 10 min, whereas the yield at same amount of non-calcined catalyst was 86 % in a reaction time of 35 min.

ChemInform Abstract: A Highly Efficient Magnetic Solid Acid Nanocatalyst for the Synthesis of New Bulky Heterocyclic Compounds.

ChemInform ◽  
2016 ◽  
Vol 47 (39) ◽  
Author(s):  
Masoud Nasr-Esfahani ◽  
Zahra Rafiee ◽  
Morteza Montazerozohori ◽  
Hassan Kashi
Keyword(s):  
Heterocyclic Compounds ◽  
Solid Acid ◽  
Highly Efficient ◽  
Magnetic Solid ◽  
Magnetic Solid Acid

scholarly journals Monodisperse AgPd alloy nanoparticles as a highly active catalyst towards the methanolysis of ammonia borane for hydrogen generation

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105940-105947 ◽  
Author(s):  
Daohua Sun ◽  
Pengyao Li ◽  
Bin Yang ◽  
Yan Xu ◽  
Jiale Huang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Hydrogen Generation ◽  
Active Catalyst ◽  
Ammonia Borane ◽  
Alloy Nanoparticles ◽  
Highly Active

Monodisperse AgPd alloy NPs showed remarkable catalytic activity towards the generation of hydrogen from the methanolysis of ammonia borane at room temperature.

Preparation and application of magnetic solid acid /ZrO2/Fe3O4/WO3 for synthesis of fructone

2011 ◽  
Vol 13 (8) ◽  
pp. 1594-1598 ◽  
Author(s):  
Bo Ren ◽  
Meiqing Fan ◽  
Jun Wang ◽  
Xiaoyan Jing
Keyword(s):  
Solid Acid ◽  
Magnetic Solid ◽  
Magnetic Solid Acid
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